Sofa



FIG. 1 is a perspective view of an embodiment of a sofa showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left side elevational view (right side elevational view is a mirror image thereof); and,

FIG. 5 is a rear elevational view thereof.

The present application is related to co-pending U.S. design patent application No. 29/399,160 filed Aug. 10, 2011; co-pending U.S. design patent application No. 29/399,174 filed Aug. 10, 2011; co-pending U.S. design patent application No. 29/399,177 filed Aug. 10, 2011; and co-pending U.S. design patent application No. 29/399,167 filed Aug. 10, 2011. 

CLAIM The ornamental design for a sofa, as shown and described. 